Lifting pump



Sept. 21, 1926.

J. J. DUCKWORTH LIFTING PUMP I Filed Feb. 2. 1924 awe/whom .5 ings.

Patented Sept; 21, 1926.

UNITED STATES eam CENT TO DUCKWOBTH,

OF SALT LAKE CITY, UTAH. I

marine PUMP.

Application filed ilE'ebruary 2, 1924. SerialNo. 690,254.

This invention relates to pumps for lifting liquids and is directedparticularly to an improved foot valve and cage.

7 One feature of theinvention includesthe 5 particular shape andposition of a removable valve cage which is normally supported by itsown weight at the lower end of a pump cylinder and projecting below thecylinder so that the valve is wholly outside of the cylinder, and thusdoes not occupyany space which might be used in the travel of the pumpplunger. I r

Another feature is the construction of the removable cage which has acentral opening at the top through which a valve ball may be inserted.After the ball is inserted, radially extending lugs are screwedcentrally into the top opening, thus serving the dual function ofpreventing the upward displacement of the ball and also constitutingmeans by which the cage may be lifted with the use of a peculiarlyshapedgrapple device. No claim'is made to the grapple device but .claimsthereto are presented in my copending application Serial No. 127,395,filed August 5, 1926.

' Theabove and additional features and advantages will be described andclaimed in detail in the followingspecification and 3 claims, andillustrated in theaccompanying drawings, in whichz- V p Figure lis-acentral vertical sectional showing a pump cylinder having the particularvalve cage of the present invention located at itslower. end;

Flgure 2 1s a vlew of the same pump cylinder as illustrated in Figure lwith the lower 1 valve cage shown in elevated position as .lifted b theparticular grapple device shown =f in Figure 5;

Figure 3 is a view looking downwardly at the top of the valve cage whenthe grapple device of Figurej5 is beingintroduced into the top of thevalve cage;

' Figure ,4 is a sectional View taken on line H of Figure 2, lookingdownwardly and illustrating how the grapple radially projecting armsengage and support the corresponding lugs of the valve cage-;,and

Figure 5 is a front elevation of the grapple device used for engagementwith the lugs of the valve cage. Likefreference characters refer to likeparts of the difierent figures of' the drawview the p Referring indetail to thejdraw'ings, the figures illustrate a pump cylinder havingin con unction therewith a lower cage valve. wlth a ball therein and aworking plunger likewise providedwith a ball valve." 1 is .60' I thecylindrical cylinder of a pump in which a plunger 2 is mounted on thelower end of a pump rod 3 (see Fig. 1). The working .plunger 2 has aclose fit with thecylinder walls and has its upper end 2 provided'with.65 a central threaded opening 2? for'the recep tion of a pump rod andalso a plurality of openings 2 through which liquids to be lifted maypass upwardly during the working movement of the plunger. The extremeupper end wall of the plunger is terminated with a relatively sharp edgeadjacent the cylinder walLwhich issoidesigned in order that sand or likeabrasive material will not tend to collect adjacent the cylinder walland.

injure the same. A recess 2? is provided at i one side of the upper'endof'the plunger, through which a cotter pin 3. extends to lock thepumprod 8 with respect to'the I plunger 2. The lower end of the plunger2 is provided with an internal threaded poirtion 2 in which a flangedcollar projects,

a threaded extension 4* of the collar. engaging the threaded portion 2of the plunger.

A locking set screw 6 projects from the lower face of the flange 4upwardly and engages the threaded portion 4 and the plunger wall to lockthese parts againstrelative rotation.

A ball 5 is normally positioned within the central hollow space of theplunger and during the lifting movement of the'plun'ger the ballnormally rests on the up'per inner circular edge of the'portion 4 ,,thusclosing the opening throughithe flanged collar aand preventing passageof liquid downwardly through the plunger. To remove the ball from withinthe plunger or to insert it in the plunger, it, is necessary to removethe locking screw 6 and to unscrew the flanged collar l from the plunger2. I

The cage valve 7 is positioned at the lower end ofthe pump cylinder 1and projects" below the pump cylinder. The'cage valve 7 has a main bodyportion witha cylindricalexterior and which is removable upwardlythroughthe length of the pump cylinder, Ias will be described. 7 a is abeveled seat within 7 the body of the cageuponwhich seat the ball 8V isadapted to normally rest. At the ex treme' lower end of the'jvalve cagetherea're rr i-r. I

; liquid enters of openings 7* through which during the lifting strokeof the pump. At theupper end of the cage there is an annular'laterallyprojecting flange .7", the outside diameter of which is slightly less aplurality than the inside diameter of the pump cylinder. The cage 7 hasupper end openings with side walls 7 v The cage is supported at theextreme lower end of the cylinder 1 by means of a screw-threaded collar9 which has an inwardly extending flange 9 loosely encircling thecylindrical'body of the cage 7 and on the upper surface of which thelower tight fit.

i der will now be described.

collar 9.

side of the flange 7 of the cage is adapt-ed ugs which extend radiallyand centrally from theside wall 7 and thus project into the upper endopening of the cage. These lugs are illustrated in Figures'l and 2 as 1Screw threaded through the wall of the cage and through the projecting-flange 7. As shown in Figures 3 and 4, the lugs 10 pro-- 'ect only.sufliciently far so that they may be engagedby a grapple device which is'iins-ertable centrally, through the upper end opening of the valvecage, as will be de- 1 scribed. The grapple device shown in sideelevation p bloclrmember 11 having a central opening Lin lugure 5consists of a body .11, (seeFigure 2) for the reception of the threadedend of an operating rod. A plurality of radially extending arms 11 areshown ashavlng grooves or notches in their upper surfaces in which thelugs 10 are adapted to be seated when the grapple de vice brought intoengagement with the valve cage and with the lugs for the removal of thecage upwardly. Preferably the upper I portion of thebloick 11 istapered, as shown in Figs. 2 and 5, so that it may be guided easily intoposition during its upward move I ment. 7

"When the cage inposition at the low-er end of the pump. cylinder, asillustrated in Figure 1,,and it is desired to lift the cage upwardly,the following general procedure is followed. The pump rod 3and theplunger 2 are drawn upwardly and removed from the cylinder. The pump rod3 may then be disconnected from the plunger or a similar rod may be usedand the rod or its substitute isthreaded into the opening 11' of thegrapple device 11. The device is then lowered downwardly andinserted'into the rupper end opening of the valve cage 7, and

downwardly along the wall 7 substanftiallyas represented in Figure 3,the arms 11 lying between adjacent lugs 10. Then the rod 3 and thegrapple device 11' is rotated with respect to the valve cage until thearms 11 are brought into registry immediately beneath the lugs 10. Thedevice is then lifted upwardly and the lugs become seat-ed in thegrooves of the arms 11, and the valve cage may then be drawn upwardlythrough the pump cylinder, substantially as shown in Figure 2.

It will thus be understood that the present invention provides animprovement in lifting pumps whereby the lowermost or foot valve may beremoved without necessitating the removal of the entire pump cylinuerorother pipe ,on which the valve is mounted. The invention includes alsothe peculiar position of the valve cage which is located chiefly belowthe cylinder and yet may he removed upwardly through it. n

The material of which the parts are constructed may satisfactorilyinclude a steel tube or cylinder, a brass or bronze plungerworlringwithin the cylinder, and a lower foot valve cage whichlikewiseis preferably a of brass or bronze. The valves include ballswhich may be of solid rubber or other relatively 1 heavy durablematerial which will serve to close the respective openings in theplunger and the foot valves I I claim v 1. In a pump having a pumpcylinder and a valved lifting plunger therein, a removable valve cagelocated at the lower end of the cylinder and projecting below saidcylinder, said cage having a laterally extending flange at its upper endanda downwardly extending bodyportion, said cage also having a centralopening at its upper end and a plurality of lugs projecting centrallyfrom the wall of said opening, and supporting means for said cagemounted on the lower end of said cylinder and having an inwardlyextending flange loosely encircling said body portion of said cage andon which i 2. In a pump having a pump cylinder and a valved liftingplunger therein, a removable 7 valve cage located at the lower end ofthe cylinder and projecting below said cylinder, said cage having alaterally extending'flange at its upper end and a downwardly extendingbody portion, said cage also having a central opening at its upper endand a plurality of lugs projecting centrally from the wall of saidopening, a valve seat within said cage and located at a level below thelower end of the pump cylinder, a ball valve located between said lugsand said seat,"and. supporting means for said cage mounted on the lowerendof said cylinder and having an inwardly extending flange looselyencircling said body portion of said cage and on cage normally rests. v

on r

3. In a pump having a pump cylinder and a valved lifting plungertherein, a removable valve cage located at the lower end of the cylinderand projecting below said cylinder, said cage having a laterallyextending flange at its upper end and a downwardly extending bodyportion, said flange having its outer extremities spaced centrally fromthe walls of said cylinder, and supporting means for said cage, havingan inner thread engaging an outer thread on the lower end of saidcylinder and havingan inwardly extending flange loosely encircling saidbody portion of said cage and on which said laterally extending flangeof said cage normally rests.

4. In a pump having a pump cylinder and a valved lifting plungertherein, a remov able valve cage located at the lower end of thecylinder and projecting below said cylinder, said cage having alaterally extending flange at its upper end and a downwardly extendingbody portion, said flange having its outer extremities spaced centrallyfrom the walls of said cylinder, supporting means for said cage, havingan inner thread engaging an outer thread on the lower end of saidcylinder and having an inwardly extending flange loosely encircling saidbody portion of said cage and on wh1ch said laterally extending flangeof said cage normally rests,

lower end of said cylinder, and a valve nor- I mally resting on saidseat and removable from the cage throughsaid central opening. 6. In apump having a pump cylinder and a valved lifting plunger therein, aremovable valve cage located at the lower end of the cylinder andprojecting below said cylinder, the said valve cage having a centralopening at its upper end, a valve seat formed by-the inner wall of saidcage and integral there with and located at a level below the lower endof said cylinder, and a ball valve normally resting on said seat andremovable from the cage through said central opening and having adiameter slightly less than the shortest distance across said centralopening.

In testimony whereof I aflix my signature. 7 i

JOSEPH J. DUGKWORTI-I. 3

